Viessmann B2TF - Page 106

106
0.2
Outside temperature in °C
Boiler water or flow temperature in °C
Slope
2.4 2.6
2.8
3.0
3.2
3.4
90
80
70
60
50
40
30
0 -5 -10 -15 -20510
2.0 2.2
Set room temperature in °C
35
30
25
20
15
10
5
0.4
0.6
0.8
1.0
1.2
1.4
-30-25
1.8 1.6
Fig. 57
Slope setting ranges:
■
Underfloor heating systems: 0.2 to 0.8
■
Low temperature heating systems: 0.8 to 1.6
Set room temperature
Standard room temperature or comfort room tem-
perature
Individually adjustable for each heating circuit.
The heating curve is offset along the set room temper-
ature axis. The start and stop points of the heating cir-
cuit pumps depend on the Heating limit... outside tem-
perature, heating circuit... setting.
90
-20
26 + 20
A
C
D
E
B
Fig. 58 Example 1: Adjusting the set room tempera-
ture from 20 to 26 °C
A
Flow temperature in °C
B
Outside temperature in °C
C
Set room temperature in °C
D
Heating circuit pump "OFF"
E
Heating circuit pump "ON"
Changing the set room temperature
Operating instructions
Reduced room temperature
+20 14 5
90
-20
D E
A
C
B
Fig. 59 Example 2: Adjusting the reduced set room
temperature from 5 °C to 14 °C
A
Flow temperature in °C
B
Outside temperature in °C
C
Set room temperature in °C
D
Heating circuit pump "OFF"
E
Heating circuit pump "ON"
Changing the reduced set room temperature
Operating instructions
Changing the slope and level
Individually adjustable for each heating circuit.
Function description
Control functions (cont.)
6151778
Functions